Thanks @Stomper for the tag.
You shouldn't have too many problems with the humidity as long as you have good airflow. If you want better peace of mind, you could use an fungicide spray while in veg. I don't spray anything on mine once they start to bud.
I don't knock the bag seed. For years it was all I could get. It's only been recently that I've been able to get known strains.
While the feminized seeds help with not having to sex them, they aren't necessarily better as a finished product. You still have to watch for hermies or you'll still get seeds.
The tips burning is from too high of an initial dose of nutrients, most likely. While you went with a half dose, it was still a little too heavy for the first time.
Water, water, feed. Not all strains feed the same. Some are heavier feeders than others. Take spicy food...I love it! My wife can't handle as much spice anymore, so I'm cutting back. We both love the flavor, but she can't handle as much as I can.